[URL="http://api.tweetmeme.com/share?url=http://espn.go.com/nfl/story/_/id/8504049/robert-griffin-iii-washington-redskins-start-concussion-source-says&service=bit.ly&source=espn"][IMG]http://api.tweetmeme.com/imagebutton.gif?url=http://espn.go.com/nfl/story/_/id/8504049/robert-griffin-iii-washington-redskins-start-concussion-source-says[/IMG][/URL]Redskins rookie quarterback Robert Griffin III, who suffered a concussion last week, will start Sunday's game against the Vikings, a league source has told ESPN NFL Insider Adam Schefter.